<template>

    <div class="app-container">

        <h2 style="text-align: center;">发布新课程</h2>

        <!-- :active="2"就是表示点击两次下一步才会到这个页面 -->
        <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
            <el-step title="填写课程基本信息" />
            <el-step title="创建课程大纲" />
            <el-step title="提交审核" />
        </el-steps>


        <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
        <!-- 章节 -->
        <ul class="chanpterList">
            <li v-for="chapter in chapterVideoList" :key="chapter.id">
                <p>
                    {{ chapter.title }}

                    <span class="acts">
                        <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                        <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                        <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                    </span>
                </p>

                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li v-for="video in chapter.children" :key="video.id">
                        <p>{{ video.title }}
                            <span class="acts">
                                <el-button type="text" @click="EditVideo(video.id)">编辑</el-button>
                                <el-button type="text" @click="deleteVideo(video.id)">删除</el-button>
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>

        <div>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
        </div>

        <!-- 添加和修改章节表单 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title" />
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number v-model="chapter.sort" :min="0" controls-position="right" />
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
            </div>
        </el-dialog>


        <!-- 添加和修改课时表单 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
            <el-form :model="video" label-width="120px">
                <el-form-item label="课时标题">
                    <el-input v-model="video.title" />
                </el-form-item>
                <el-form-item label="课时排序">
                    <el-input-number v-model="video.sort" :min="0" controls-position="right" />
                </el-form-item>
                <el-form-item label="是否免费">
                    <el-radio-group v-model="video.free">
                        <el-radio :label="true">免费</el-radio>
                        <el-radio :label="false">默认</el-radio>
                    </el-radio-group>
                </el-form-item>
                <!-- 
                    :on-success 上传成功执行的方法
                    :before-remove 删除视频之前执行的方法
                    :on-remove 删除视频执行的方法
                    :file-list 视频列表
                    :on-exceed
                    :action 请求的后端的接口的地址
                    :limit="1" 允许上传文件的数量
                 -->
                <el-form-item label="上传视频">
                    <el-upload :on-success="handleVodUploadSuccess" :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove" :on-exceed="handleUploadExceed" :file-list="fileList"
                        :action="BASE_API + '/eduvod/video/uploadVideo'" :limit="1" class="upload-demo">
                        <el-button size="small" type="primary">上传视频</el-button>
                        <el-tooltip placement="right-end">
                            <div slot="content">最大支持1G，<br>
                                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                            <i class="el-icon-question" />
                        </el-tooltip>
                    </el-upload>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
                <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
            </div>
        </el-dialog>


    </div>
</template>
  
<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
    data() {
        return {
            chapter: {
                // chapter用于封装章节的数据
                courseId: '',
                title: '',
                sort: 0,
            },
            dialogChapterFormVisible: false,//表示章节弹框的值
            saveBtnDisabled: false, // 保存按钮是否禁用
            chapterVideoList: [],//存放章节小节的集合
            courseId: '',//课程id
            // ----
            saveVideoBtnDisabled: false, // 课时按钮是否禁用
            dialogVideoFormVisible: false, // 是否显示课时表单
            chapterId: '', // 课时所在的章节id
            video: {// 课时对象
                id: '',
                title: '',
                sort: 0,
                free: 0,
                videoSourceId: '', //视频资源id
                videoOriginalName: '',//视频名称
                size: 0
            },
            // 
            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },

    created() {
        // 获取到路由里面的id值
        if (this.$route.params && this.$route.params.id) {
            this.courseId = this.$route.params.id;
            // 调用方法
            this.getChapterVideo();
        }
    },

    methods: {

        // ==========================下面这部分是针对小节执行的相关操作==================================
        // 点击小节里面的编辑按钮执行这个方法
        EditVideo(videoId) {
            this.dialogVideoFormVisible = true;
            video.getVideoInfoById(videoId).then(response => {
                this.video = response.data.eduVideo;
                // this.fileList = this.video.videoSourceId;
            })
        },
        // 点击添加小节执行这个方法
        openVideo(chapterId) {
            this.dialogVideoFormVisible = true;
            // 设置章节id
            this.video.chapterId = chapterId;
            this.video.title = ''// 重置章节标题
            this.video.sort = 0// 重置章节标题
            this.video.videoSourceId = ''// 重置视频资源id
        },
        //点击确定按钮就执行这个方法
        saveOrUpdateVideo() {
            // this.saveVideoBtnDisabled = true
            if (!this.video.id) {
                this.saveDataVideo()
            } else {
                this.updateDataVideo()
            }
        },
        saveDataVideo() {
            // 设置课程id
            this.video.courseId = this.courseId;
            video.saveVideoInfo(this.video).then(response => {
                // 关闭弹窗
                this.dialogVideoFormVisible = false;
                this.$message({
                    type: 'success',
                    message: '添加小节成功!'
                })
                // 刷新页面
                this.getChapterVideo();
            })
        },

        updateDataVideo() {
            video.updateVideoInfoById(this.video).then(response => {
                // 关闭弹窗
                this.dialogVideoFormVisible = false;
                this.$message({
                    type: 'success',
                    message: '修改小节成功!'
                })
                // 刷新页面
                this.getChapterVideo();
            })
        },
        // 删除小节就执行这个方法
        deleteVideo(videoId) {
            // ---------确认删除提示框
            this.$confirm('此操作将删除章节的信息, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                // 执行.then说明需要删除，后面执行删除代码
                video.removeByIdVideo(videoId)
                    .then(response => {
                        // 提示信息
                        this.$message({
                            type: 'success',
                            message: '删除成功!'
                        });
                        // 刷新页面
                        this.getChapterVideo();
                    })
            })
            // ---------确认删除提示框
        },


        // ==========================下面这部分是针对章节执行的相关操作==================================


        // 修改弹框做数据回显
        openEditChapter(chapterId) {
            // 弹框
            this.dialogChapterFormVisible = true;
            // 调用接口
            chapter.getChapterInfo(chapterId).then(response => {
                this.chapter = response.data.eduChapter;
            })
        },
        // 根据课程id查询章节和小结
        getChapterVideo() {
            chapter.getAllChapterVideo(this.courseId)
                .then(response => {
                    this.chapterVideoList = response.data.list;
                })
        },
        // 点击上一步执行的方法
        previous() {
            console.log('previous')
            this.$router.push({ path: '/course/info/' + this.courseId })
        },
        // 点击下一步执行的方法
        next() {
            console.log('next')
            this.$router.push({ path: '/course/publish/' + this.courseId })
        },
        // 添加章节的方法
        addChapter() {
            // 设置课程id到chapter对象里面
            this.chapter.courseId = this.courseId;
            chapter.addChapter(this.chapter)
                .then(response => {
                    // 关闭弹框
                    this.dialogChapterFormVisible = false;
                    // 给出提示信息
                    this.$message({
                        type: 'success',
                        message: '添加章节成功'
                    });
                    // 刷新页面
                    this.getChapterVideo();
                })
        },
        // 修改章节执行的方法
        updateChapter() {
            chapter.updateChapter(this.chapter).then(response => {
                // 关闭弹框
                this.dialogChapterFormVisible = false;
                // 给出提示信息
                this.$message({
                    type: 'success',
                    message: '修改章节成功'
                });
                // 刷新页面
                this.getChapterVideo();
            })
        },
        // 删除chapter的方法
        removeChapter(chapterId) {
            // ---------确认删除提示框
            this.$confirm('此操作将删除章节的信息, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                // 执行.then说明需要删除，后面执行删除代码
                chapter.deleteChapter(chapterId)
                    .then(response => {
                        // 提示信息
                        this.$message({
                            type: 'success',
                            message: '删除成功!'
                        });
                        // 刷新页面
                        this.getChapterVideo();
                    })
            })
            // ---------确认删除提示框
        },
        // 点击确定按钮执行这个方法
        saveOrUpdate() {
            if (!this.chapter.id) {
                this.addChapter();
            } else {
                this.updateChapter();
            }
        },
        openChapterDialog() {
            this.dialogChapterFormVisible = true;
            this.chapter.title = '';
            this.chapter.sort = 0;
        },
        // 上传视频之前执行的方法
        handleUploadExceed() {
            this.$message.warning('只能上传一个视频哦！请删除原来已经上传的视频')
        },
        // 视频上传成功之后执行的方法
        handleVodUploadSuccess(response, file, fileList) {
            this.video.videoSourceId = response.data.videoId;
            this.video.videoOriginalName = file.name;//file.name用于取得上传视频成功之后的名字
            this.video.size = file.size
        },
        // 移除视频之前执行的方法，也就是点击X执行的方法
        beforeVodRemove(file, fileList) {
            return this.$confirm(`确定移除 ${file.name}？`);
            this.handleVodRemove(file, fileList);
        },
        // 移除视频执行的方法
        handleVodRemove(file, fileList) {
            video.removeById(this.video.videoSourceId).then(response => {
                this.$message({
                    type: 'success',
                    message: "删除视频成功！"
                })
                // 让fileList为空，不显示
                this.fileList = [];
                // 上传视频id赋值
                this.video.videoSourceId = '';
                // 上传视频名字赋值
                this.video.videoOriginalName = ''
            })
        },
    }
}
</script>

<style scoped>
.chanpterList {
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}

.chanpterList li {
    position: relative;
}

.chanpterList p {
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
}

.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList {
    padding-left: 50px;
}

.videoList p {
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
}
</style>